feat(users/flokli/nixos-tvix-cache): increase scraping interval

This provides more resolution in the dashboards.

Change-Id: I06e7260250e58fe62bbda41b67d84e0c5cacfbd2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12927
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Reviewed-by: Jörg Thalheim <joerg@thalheim.io>
Autosubmit: flokli <flokli@flokli.de>

users/flokli/nixos/nixos-tvix-cache/monitoring.nix

@@ -80,6 +80,7 @@ in
     prometheus.scrape "main" {
       targets    = prometheus.exporter.unix.main.targets
       forward_to = [otelcol.receiver.prometheus.default.receiver]
+      scrape_interval = "15s"
     }
 
     // Convert Prometheus metrics to OTLP and export them.
@@ -167,7 +168,7 @@ in
           uid = "mimir";
           url = "http://localhost:9009/prometheus";
           jsonData = {
-            timeInterval = "60s";
+            timeInterval = "15s";
           };
         }
       ];